I am not saying to hide it - but if it is repaired correctly, it would raise unnecessary concerns to highlight it. I think it's admirable being honest, but again these are steel framed vehicles and CAN be repaired - back to good as new. As disheartening and pathetic as it is that the tech screwed up the recall the first time, and I know you want to jump up and down and say it devalued your vehicle, yell at someone, etc - (I would certainly do the same) logically, I don't think the devaluation is there if it is corrected.
He's never going to get anything like that from D-C, as they won't inspect the car, so it's up to him / his dealer to find someone VERY CAPABLE to fix the mistake to his satisfaction.
If my car had been screwed up, I would have it fixed - finding someone I could trust to do it correctly and had confidence that they knew how to weld and were sticklers for details - and I'd have complete confidence in the structural integrity of the frame afterwards - I would not treat the car any differently - still track it, still run Hoosiers, etc. And if I had confidence in the vehicle, I really couldn't see how it would be devalued by a lot (if any).
So bringing up a botched recall and a painstaking repair (a few hundred dollars) unless you explained it VERY THOROUGHLY to an educated buyer would be unnecessary worry - however, if you had complete confidence in the repair, you could definitely explain the situation... Make sense? If you are confident, then there's both no need to disclose it, but it's easier to explain confidently and shouldn't impact the value. If you are not happy with the repair, then you both should disclose it and it will probably impact the value.
Hope this makes sense.
If the same dealer is saying they'll fix it good as new, I'd be VERY suspect, by the way.